Permanent-magnet synchronous motor, and power generation alternating operation system and adjusting method

Abstract

The invention, which belongs to the technical field of permanent magnet synchronous motor controlling, relates to a permanent-magnet synchronous motor, and a power generation alternating operation system and adjusting method. On the basis of a bidirectional transmission circuit of energy, the permanent-magnet synchronous motor converts the electric energy into the mechanical energy in a motor operating state and converts the mechanical energy into the electric energy in a generator operating state, and then the electric energy is returned back to a power supply. With a direct-current voltage variable circuit of a direct-current link, the direct-current voltage is reduced when the permanent magnet synchronous motor works at a low speed; and the direct-current voltage is boosted when the permanent magnet synchronous motor works at a high speed. The direct-current voltage matches the operating speed of the permanent magnet synchronous motor, so that the control performance of the permanent magnet synchronous motor is improved.

Description

technical field [0001] The invention belongs to the technical field of motor control in electrical engineering, and in particular relates to a permanent magnet synchronous motor electric and power generation alternate operation system and an adjustment method thereof. Background technique [0002] Permanent magnet synchronous motors are more and more widely used in industrial production, and the control performance of permanent magnet synchronous motors is the key to the success or failure of permanent magnet synchronous motors. It is one of the main control methods of permanent magnet synchronous motor to control the speed of motoring / generating state in a wide speed range. [0003] The current research on the control of permanent magnet synchronous motors is mainly reflected in two aspects: [0004] 1. The permanent magnet synchronous motor usually operates in the motor mode. By converting electrical energy into mechanical energy, the mechanical device is driven to run. I...

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Problems solved by technology

[0004] 1. The permanent magnet synchronous motor usually operates in the motor mode. By converting electrical energy into mechanical energy, the mechanical device is driven to run. In the motor operating mode, the energy of the controller is transmitted from the power supply to the permanent magnet synchronous motor in a single way, and the DC link Energy cannot be reversed back to the power supply, wasting power;

[0005] 2. If the permanent magnet synchronous motor keeps the DC voltage constant, when the rotor is running at low speed, the voltage required by the stator winding is low, and it can only be realized by reducing the width of the PWM pulse, so that the actual harmonics in the terminal voltage of the stator winding The component increases, which causes the current pulsation of the stator winding, which makes the dynamic and static characteristics of the permanent magnet synchronous motor worse

[0006] Application number 201580014881.5, the name of the invention is DC motor and generator, which discloses that the permanent magnet can be rotated together with the shaft and is installed around the shaft, a coil is installed around the permanent magnet, and an electromagnet is installed around the permanent magnet, and a battery is used to make the electromagnet run, and then control the operation of the electromagnet through the electromagnet operating / non-operating device, thereby controlling the rotation of the permanent magnet. The rotation of the permanent magnet drives the coil to generate electric energy and sends it back to the power supply. At the same time, the coil of the motor shaft cuts the magnetic induction line to drive the motor shaft to rotate. Although the invention also solves the problem of utilizing the electrical energy of the electric motor, its structure is complicated, and the electric motor and the generator work simultaneously, which consumes a lot of energy.

[0007] Application number 201510019524.X, invention name permanent magnet synchronous motor control method and device, discloses a method of obtaining the torque current of the permanent magnet synchronous motor according to the stator current of the permanent magnet synchronous motor; controlling the permanent magnet synchronous motor according to the torque current The operation of the permanent magnet synchronous motor effectively improves the control accuracy of the permanent magnet synchronous motor, but it does not solve the problems of large torque ripple, poor dynamic and static characteristics, and poor control performance of the permanent magnet synchronous motor

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